(19)

(11)

EP 0 495 972 A1

(12)

(43) Date of publication: 29.07.1992 Bulletin 1992/31 (21) Application number: 91915697.0 (22) Date of filing: 13.08.1991

(51) International Patent Classification (IPC):  A61C 5/ 00( . ) G02B 27/ 00( . ) H01J 61/ 88( . ) A61C 13/ 15( . ) H01J 61/ 20( . ) (86) International application number: PCT/US1991/005745 (87) International publication number: WO 1992/003104 (05.03.1992 Gazette 1992/06)

(84) Designated Contracting States: AT BE CH DE DK ES FR GB GR IT LI LU NL SE (30) Priority: 13.08.1990 US 19900565732 (71) Applicants: WELCH ALLYN, INC. Skaneateles Falls New York 13153 (US) THOMAS, Brian J. Phoenix, NY 13135 (US)	(72) Inventor: THOMAS, Brian, J. Phoenix, NY 13135 (US) (74) Representative: Laurent, Michel, et al  Cabinet LAURENT et CHARRAS, 20, rue Louis Chirpaz B.P. 32 F-69131 Ecully Cédex F-69131 Ecully Cédex (FR)